ベーリング海東部におけるフィッシュミール船団所属以東底曳船の1日の曳網数と漁獲量・漁場深度との関係
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概要
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This report dealt with the bathymetric change of the frequency distribution of daily hauls per boat in relation to the daily catch found in the daily reports of 22 Danish seiners of one of the fish-meal fleets fishing in the Bering Sea during an entire season in 1963. The tendency of increase in daily catch manifested, as stated in the previous reports1)2), the necessity of discussion on the bathymetric difference in the daily hauls per boat being stratified according to the grades of daily catch. And the further stratification of the same records analyzed in the previous reports into the four grades of daily catch per boat of 10 ton intervals (the records were already stratified according to the fishing areas and the fishing depths of 10m intervals) made it possible to get the following findings: 1. In most of the groups of samples, the frequency distribution of day-and-boats with respect of the number of daily hauls per boat plotted against (11-χ) on logarithmic scale was agreeable to the normal series (where a boat conducted χ hauls a day), although those of some of the groups were thought to be the modification of this type and those of the others with good catch were normalized. These facts suggested that the above-mentioned type may be indicative of daily hauls per boat of the Danish seiners probably with the uniform per-formance fishing in the same depth zones of the same areas. 2. The groups of samples yielded the same grades of daily catch per boat showed the tendency of decrease in daily hauls per boat with increase in fishing depth; this tendency was very conspicuous in Area A, whereas very faint in Area C. It became, therefore, clear that the same tendency found before the stratification of the records according to the grade of daily catch was not the false one owing to the bathymetric difference in daily catch but the probably essential one owing to that of some other factors of significance. 3. The groups of samples in the same depth zones showed the tendency of decrease in daily hauls per boat with increase in daily catch per boat, although the boats repeated to haul the net on the days yielded the catch of 10 to 19 tons a boat as frequently as or less frequently than on the days yielded the catch of 20 to 29 tons a boat. 4. The standard deviation of daily hauls per boat seemed to change dependently of either the fishing area or the fishing depth, but that of the samples in the same depth zone of the same area was similar to one another regardless of the grade of daily catch per boat.
- 公益社団法人 日本水産学会の論文
著者
関連論文
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- ベーリング海東部におけるフィッシュミール船団所属以東底曳船の1日の曳網数と漁獲量・漁場深度との関係
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- 揚縄速力の時間変化 (マグロ延縄の揚縄速力-1,2-〔英文〕)
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